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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133d3a8a76e6589c2ee5975533b5bafdd9990ef704bf297fd12463e860f805e7' 
  AND token = 'G13r+Si9Ucwm67XSFsI8XDT3AVd+X6kRJR3RvjVKBUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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