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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d4e9c63038c8894d50c0339fe71253ed593e9fd8bad010de9f9afa22ffc4a0' 
  AND token = 'nqs0+jN+rKrwj9jSWSMlKjYkeshPjl/M/2A1+U/BMaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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