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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7406da7cdd62f00ebe97a1d0fcebf8415b35fc7afd63e513385a8e3399e1f3e' 
  AND token = 'Z23nMJ6pPmmIHyAAZfy2RHzvhHIo6Ou+sldmBtY/a30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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