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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0ebfbb573813e1ffb3288caf02c392e3fb34f7032ad643478c13fc3f75874e' 
  AND token = 'leWGnw56Z5nctumJaaMMLVSnfAQL8fH0CuB29xpyMk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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