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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b567f815051667bd55c33e424ca19937cd0f93888c681de5614fa582a4b39a3f' 
  AND token = 'XUBWvTDvZkR4kaECY7f3A8TuLwHsvDljLI8br1lGFxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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