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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22cef0d8e534f06d339ab283839de7c2eafc5b89e51bf5259c5d9e08c4db98e8' 
  AND token = 'EXoC7ZLfpBKTjPIVqyXkF6is0l3eP0Ga4FCbYgFShaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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