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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fbba4a27a50ff6b5fa7cb58355e73679bca6f5e86997729799126c79dd2ed7' 
  AND token = 'zWJ4R4YE779p9oApIe0iShdgRJaZMIE4ibsqnGaDiRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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