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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be4f899a6c2d0f85e1d96fbc73106ca3492ec39a43197ce18d3cc6f050e5625' 
  AND token = '095fzMFo10xh12iOHzae/N9kcMKrz9utyHijCLSDdy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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