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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1db2b95c807086f4c601d3e099b59a2d22ca059fa8e5024bd4202ed7099712' 
  AND token = 'RwxstX91buSNXKqhQj0H66ZFKDC+flU7W0fjS8x3oxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}