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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0d7a81a5bf130d64abc35d93eb9ee12d805608186918297730b4cb6194d9be' 
  AND token = 'AcgQuhECbEuUejUwsESH7zE7e8McAARDeg9tsHdteBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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