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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecea94ad8dc8affc4717b026a4593caa2fdbc2c6f1b3c4895f351529fcae9760' 
  AND token = 'N9p9BcvKMJRpGR2OIXwIwV6HrDxcoSm/ugLO+nnNNnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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