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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6239ed32179712e157e84d6476095798c96c4bfb3f91efc1aad51046d5dc5e8' 
  AND token = 'j/CGFY96/vRGfifncOZhdDSr8pA25E801svBiNWNYdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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