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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5c428b6d540f47dc8c0993c4c077dc84582397e5c1946e125e1791c8b8fc84' 
  AND token = 'BypoSDxKyYS7nku00kYJl8OfMfkGgULpxCOY6GSJ3Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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