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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ed9e529333f24ec54e12790c0ef611d97f71f89f59e423d68aa413d0b55b56' 
  AND token = '8Qs8TNuWzUlKQVwSQzoN2jq8Sx9RJm5tZETDNSYyrpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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