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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b368435c8de002f24a8ae5ebd4bec1afb4324d85c409e4dfb2549a70b24988de' 
  AND token = '7W27Kb9su+Kn6tW59SZF86z98rp1hT+rGTneO2IcAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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