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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a8ac846b858f5f0ca90ba3fbee9fb67ca0af6e5c01e3b5ebd232ea22f1a0ec' 
  AND token = 'Sg/QfyNj5p9T2m9gYWPqdDBLpEkWUJ5Jg1SymA4UvHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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