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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcc3d9a1efe8b03d3e5a76899de40b50978e37c96affa64b78173c83262ca12' 
  AND token = 'UbXBmnuPg/bpHKW0Uk4v7pRtvADKprtZcGG5Tk1QZg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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