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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd4d672b8976cf51a08756f09d7ce358884189e7fa1a0566dd30300c1cd2c8a' 
  AND token = '+NKbLDXX005Ed9GsrKTcFTTJqaQE6ZhQfGYk9mJSi/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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