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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ae3a9594666a649ddb57c35efafddd306ee96b20710d48aac65dec9c3fc659' 
  AND token = 'CVhwzU06uupMR89qpeyg5efMDoByi7mlm7ZnRfZnZmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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