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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7aa9728ca2cf525b601852a486474a6659c4ed31d467a9bd26b594e242cc7a' 
  AND token = '0sd9qbOIPuIPZ+OuC6e15mJnM5VxPqbEinQp1IjfMow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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