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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7232dcb4c246ae222e1b1f3ec2e9b6cb4bcf8ef9e217fb28b377a3237fcf23' 
  AND token = 'ARILu9OINDTI056TUn+t6T9zLdCT8FSWt0hEJvb+/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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