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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe508627e98126c6b25c98c93b5436783222a8e1ee57757bbae4c718835f0b87' 
  AND token = 'r0o0VnFHmdJoKOVas93wCgr9Dxq3QJkZs9m6dASZEX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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