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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7334d5e1c06d3cb00e723ba72a5eae3a9bb058074b1049506e1e892406de7e8d' 
  AND token = 'WNlXaqRhOuyCDfIgExa2CZnn3jhoo7at5dl4F8eY934=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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