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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8a39612e58e39cbf49a921d8df0c21fe9b95fe1f7944f0353201b87bafbd13' 
  AND token = '8OHA0M9GFqg0uA0CvHSUXad6uUJnFf8GvPBtySorP5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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