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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3799469d3f2e673285504ef4c59cc4ac0892a3ccba345a1f0c43ee8f46fe83da' 
  AND token = 'Pm0I270AiJXSkQ6WqLfnTq4MeTiKnlpxQOUwZKAp3mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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