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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f62b8288409cc7626b9b4e3ccecdf94af4dc40de0acc0f1f2824560cf316444' 
  AND token = 'yvYcviE/4hF8wZVqtbW8lGWSrNHPONrzuk6ZF3VfLjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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