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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef2eafdfaa146650ac7694514326f497cf868295c5383497c988eb67e6f4160' 
  AND token = 't2NQZ/23+p2RiecHnQ9B4Uo/CxIEQYcJEO5KLv5FaZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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