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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903ab0f10654204385a23cf8e12058cb2b133306d65ab8e339ca67c6e9159e8e' 
  AND token = 'M1mgRRlgeKdqlnaim4f6S0bPaJJ2AVd6D86CI/OUmug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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