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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e368b12350486fe645cd65adfec50e9f3e0b674633adb6f6efc398c2bc0d1c77' 
  AND token = 'wz5eP6Au5U1TmJBxzD7o8W0JO4m4wME8Zyj8o3F0zdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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