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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345b37e82570bbc40ffd2d478a2d95fa88748f17d75685bd66b36ccb05f42cbb' 
  AND token = 'o5201/YrhA3MEfn+n3sZdY5b8tcxg67kq/T4xmf+OHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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