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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c77564b267b43275f5184ac84f06785cc5d06bc049f2e306849811724a8f05' 
  AND token = 'yBLP1bsN1H7HWky8UZEAbHLytheqwZuC3BNWTZPe9TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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