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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605ad1a3123cb5e1c698de0e9ff20521148bebfdcdea21c711de9632d53ee2e2' 
  AND token = 'ONe+5L8rlVpVdc/wpjt191M1r54onU2ualVi43UvBEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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