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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560536ab04648ee7af5763d140926079e7695d56d8b2cc964765222147dbfc1b' 
  AND token = '5omptUzsJg0U2Xi5wccTDk4Yc3UrDcYogZnMRebxUXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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