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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3802f90952485572c6a109d06c709e70ce87096ec7148595b39dc4ee4c7d2' 
  AND token = '+k041PHKK5R+GImgcGlZNIfDNoN2eZItqlc8kgSDEB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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