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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d68c6eec3a11d71e0c580211eee60d1e45c19d11fc598ceac9089a0a4e702d9' 
  AND token = 'IBifnnR9sjLK5ew+YnO3mvefcDIlhZr6n99XEtdhv6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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