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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3879e7bcab06751e2a3c864dd1ce1e295e1f4b5c589a1782331b8f8eb1d055' 
  AND token = '8AZ6mT8q4H16PqlfTrMr3YCwv5/eSwJQZRvX/nSV5j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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