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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d98a5aaf87d1804de94dc66d73d93702eb12e3437badb4b8d360d21d7d8f842' 
  AND token = 'aZHVmc1FXaf7gXS/dttwi09CsSIwe8JD5PfmswmXDw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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