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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2987e116be2104c93b7973c6105ceabec6383fd033e3c80d4a33560e95ccc44' 
  AND token = 'auwK4h8UDQxk1FQxGx+AmRcPbzvM07O/zdMihdwLnCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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