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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dba4474febeb7bd4eea53427a3ec2e2553178c6d983ff2dbe60b86a61ca0656' 
  AND token = 'O3mJwR2mNXOsxQqzYjPvtRzo32sn0iNwhFuikdaPBkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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