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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fde2a73b62e857b4ad351b035c3426a62e6500ae0e3afaa162710755bb2839a' 
  AND token = 'Xr98T/CLI7QlpDtkJQUe6xiTNoj/8S/0lIm70LueH5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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