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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746aabc5fede9728c9573c3c854aace302d8acd26a697fe6d26fd769283cd7d2' 
  AND token = 'y7vFYwwn0+VvkD8d/2LsxguBg+ncv6o73Goq6Tf10WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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