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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d07750fa7b3af02c45af5dab8e3192dfe9234cf7d60068c435aebde35ee893' 
  AND token = 'opydCLZ8RMRhoE/17PfSpNL35UHm2xKp3nqlw51CZsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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