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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea06da2a85a7c4e779285eb5e53cbbed129eb98741645d43235ce04ae9b315c' 
  AND token = 'f/R8NqTfWwKUycNbVHwvsMuXeFawdCNI/Ui6reT6gMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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