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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e26c4d19fb0934a843bd2361d0505cb247a20376d21d2be23e42e071939283c' 
  AND token = 'QZQEY5UOwJahCvVjmJu3rdmKY1012ybuUtl/t/hmrE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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