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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d52d9917695336c54d50ac6964e07fb0a20be4706fe91d74d57f1f2d4bb4c5' 
  AND token = 'KAeggPD9/OrMVql98MWTsOij+2Z3Av2Um3teRfAyKas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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