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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e92959b6d86208732e3f69009ffd3a1b30ba9d860d441431e4112c5e2a6593' 
  AND token = 'FNaLxeO1pj0ErE9UhVE6EsnDDJCq4QeXUZ1abm8eXgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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