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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7556cda8ae037299bd8cf8a457fd7efde62d5d5b3b612a2b5a55f926a68034' 
  AND token = 'FCLD9m7Bmh7Zm8sR546MsBQmw4I4h1rgy9QlVzCKESA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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