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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72b0a834fb8c5593cf0c9f015281b13b5c4eec92a3ee0a29ecf593c51c5d633' 
  AND token = 'a3LHeV1Wc69LqRO3njmD2ZGH0goXhugvR3F39elT96c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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