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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5565bee73cee29642676d11d8210b3eeaff70202d87f6c1448873311e0b510' 
  AND token = '6F/J+itk8LfXHWtEiB/1Y9ndARyNQa7bMMsbuhDNYwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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