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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0b6d0266007fe4657a3057997281fc5b867a9aed3660c47aafabee289cb569' 
  AND token = '8KTOmB8XzdTPuXsWyTa05cHEbsetqF7lnj9omJq7vHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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