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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beec12fd9fb57556f1d8b9694971b2043f02bc682f373b99972742aea7100e19' 
  AND token = 'diTePpOwim9LZQtVpQ+sKPFvq+YIKEEnWL3sXsvWr9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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