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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403e52c5c6511012412e698c4fe9e67c2a6f01c8b9746a07ae52b240841a7eb9' 
  AND token = '3/LTOjkFU4VAX6WfxnBxEC416H6mIyn+9VU9wfFOQvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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