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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c898a30e67b2e41eb6c1e36bf378c697e1265ff9e9c5c28246a614a20558c8' 
  AND token = 'guvkwtQC5npG8pcIFKtdbW0IofNXjDI45ltZ7jTx0Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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