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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f7864f70162efd350f1ede6d979c0373441b3c1e3256ef326e317269c2ddc7' 
  AND token = 'EtoozsV/Kkhlnk/82sRW1YM9oKsa5XEl4YS6zRxpejw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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