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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72a18ef9b1cbb6bf739c4738e84ba025fda5ef98ac35e63c0f34bfe6ac699b6' 
  AND token = 'JbAn5dxUsxo4r6OgKzqUY82KlM7uF4QC9cfc7hNAxug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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