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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acffd6b538e4d2506a902142464a34ec7dd8f9e1a91cf39d8e8bfe422b8dc68a' 
  AND token = 'xwXQs/aE0EghrmizSkSr+H0DKgdYe31bKCGbzAaA9+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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