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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4887316c318e312426d0b6d5e606fe2ed826bfc796f0be7e968d62e23015cc2a' 
  AND token = '7XEWsSPl4isgp/RkAt6BuoBF+HsrxK+68bE3uI3C21w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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