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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2410cce83d93affe7a70ab56aa82f3b55b05221a822927c48aa1476c6c3d8b' 
  AND token = 'GQD7Zzr+8VrYCxGFZ0JDceJR+7aO+0C0tlCqvQED0EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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