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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f5946abfcbf6bda9f15ac0ec3245f6c08c131986ed62740c5175490039cd3e' 
  AND token = 'ZAqxyeJPHijVUh+D+d/fHotuAr4+7BV4Du9coaeWJDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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