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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8608b5ea59b4076c23336df7c15b09b616bab0e0e6aba1ffc918eca46f6ebdfe' 
  AND token = 'InahvnXtVvaTJXxuhBot7wj7Ez3NRv+Iaus2+Lcoyso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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