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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e93a927da1e066a3e91eb8eaef65106621dd55dce0ff0b2587ed6970a01718c' 
  AND token = '6nz/JHRzqfkc0RnWM0iLa5zAHX+m2OtS55+QUTzOGjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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